Improvement in combined low-water detectors and safety-yalves



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.DANIEL BURNS, 0F BAY CITY, MICHIGAN,

Letters Patent No. 77,451, dated 1lllag/ 5, 1868.

IMPROVEMENT IN GQMBINBD Low-Warns nsrserons AND SAFETY-VALVES,

Know all men that I, DANIEL BURNS, of Bay City, in the county of Bay,and State of Michigan, have invented a new and `useful Improvement in aLowWater Gauge and Safety-Valve.; and I do declare that the following isa true and/accurate description thereof, reference being had to theaccompanying drawings,'and to the'letters of referencermarked thereon,and being a part of this specification.

The object of this invention is to so construct a safety-valve, that, inaddition to its ordinary use as a safetyvalve, it will also act as analarm, to indicate low waterin the boiler. This is a desideratum whichhas long been sought, and I am aware that various patents have beenissued'u'pon inventions claiming to accomplish the object; hut all'thesehave'proved failures, and, in thisl invention, it has been mystudy andnim' to construct an apparatus, upon" scientiiic principles, thatwillaccomplish the desiredvend.

To reach this point, I have invented an apparatus, which I willnowproceed-tovdescrihe, sothat those skilled in the art canccnstruct it.

M represents a, cylinder-boiler, of the ordinary construction, providedwith iiue N. Upon the appropriate spot, ou top ofthe boiler, I place thesafety-valve P, provided with two openings, R R, for the escape ofsteam,

Through proper stuin'gfboxesruns the valve-stem S, to which the valve Ais attached, and ground into a proper seat. Upon the top of the cap isattached the valve-lever K, by any suitable device, and a properconnection 'made withit of the valve-stems'. T isa hall or properweight, and attached to the lever 'K byel suitableA slide. This lever Krests upon a crotched slide, E, which plays upon theA lever which hasits fulc'rum as shown at U. To the outer extremity of the lever I isattached the valve-stem V, provided with the valve B, which isgroundinto a proper seat, and upon the under side thereof'. This valve-stem Vis provided withsuitable joints, J J, which assist in makin'gthe valve Bretain its proper position relative toits seat. Tothe bottom' of thevalve-stem V (which passes through the centre 'of the valve B) isattached the lc'ver D, with proper fu`lcrum at'W. To the-outer end ofthislever D is hungithe metal box G', provided with suiicientopeningsin-'the cover thereof to admit of the free passage of water.This'hox'should'be iilled with sand orne gravel,- or any like substancethat will allow of suiiicient water to he secreted among the intersticesof the sand or gravel to t accomplish the end soughtto be attained.

To use my invention, wevwill suppose that myapparatus isalreadyattachedto a Vsuitable boiler,iille.d with suicien't water, and with steam up,and-ready for worli. We will further suppose that the apparatus iscorrectlyA adjusted b-y means oi" the adjustable ball or `weight Tand'crotched slide E. Now, as the water lowers in the boiler, thew'eightedbox G falls with-it, by which incans the -valve Bis drawn down,and,l the valveA raised,A v

when the escaping steam, through the` openings R R, gives notice thatthere is a lack of water. Well-known scientific principles, which it isneedless to explain," govern the rise and fall ofthe box Gr, and alittle experience will teach any competent engineer how to adjust theball T and the crotc'hed slide'E. 1 I

What I claim as .my invention, and desire to secure by Letters Patent,is-- Thearran'gement of the within-described'box.G, filled as specified,with the levers DI K, the valves A B, the weight T, andthecrotched siideE, Slibstan'tially asand for the purpose set forth. i

' DANIEL. BURNS.

Witnesses:

J. H. Swenrwonr,

SAMUEL WELLS.

